Paternity Risk: Understanding Pregnancy After Multiple Partners

Question
I had sex with an ex within the same time I had sex with my current bf and got pregnant. I know there is a chance that the ex can be the father, but we used a condom I don't think it broke, but maybe I'm wrong.I'm freaking out over this the other part of this is that me and my current bf have sex mostly everyday 3x a day and we have unprotected sex.What is the % or chance of my ex being the father (I know this sounds stupid)Iknow there is a chance, but we used a condom

Answer
The chance of getting pregnant after using a condom correctly, without breakage or slippage, is near zero.  In general, with perfect use, the condom has a 2% pregnancy rate.  This means that, out of every 100 couples that use condoms for a year, all the time every time, 2 couples will get pregnant.  The vast majority of these pregnancies will be the result of breakage or slippage that is noticeable at the time of intercourse.  So if you didn't see any problems with the condom at the time, then the condom most likely did not fail.